JPH08122199A - Vibration tester of multi degree of freedom - Google Patents

Abstract

PURPOSE: To make the whole construction simple and small by a construction wherein a vibration table in the shape of a right-angled rectangular parallelopipedon is formed horizontally, dynamic electric vibration generators in directions X and Y are provided for a plurality of sets of vibrating means and the gravity of the vibration table is supported by a supporting means. CONSTITUTION: The vibration tester is constructed of a vibration table 1 in the shape of a right-angled rectangular parallelopipedon formed horizontally, a plurality of sets of vibrating means having dynamic electric vibration generators 3-1 and 3-2 joined to one-side wall surfaces 1-1 and 1-2 in directions X and Y of the vibration table 1 and a supporting means for supporting the gravity of the vibration table 1. Each of the vibrating means in the direction X, for instance, has a construction wherein a bearing-part joining part 4-1 having a hydrostatic bearing provided at one end part of a vibrating shaft 2-1 is joined to a prescribed joining part with the vibration table 1 and a hydraulic guide 6-1 constituted of the hydrostatic bearing is provided around the intermediate part of the vibrating shaft 2-1. Moreover, a vibrating table 7-1 of the vibration generator 3-1 is fixed to the other end part of the vibrating shaft 2-1 and thus the vibrating means in a plurality of sets formed on a floor surface are constructed. The vibrating means in the direction Y are constructed in the same way as the above.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-degree-of-freedom vibration tester that can be used for seismic resistance tests of various structures, and more particularly to a multi-degree-of-freedom vibration tester having a small vibration table. .

[0002]

2. Description of the Related Art Recently, vibration experiments have become very important for evaluating the seismic resistance and safety of large structures such as nuclear power generation facilities. There is a demand for a multi-degree-of-freedom vibration testing machine capable of vibrating in various degrees of freedom.

On the other hand, since these test products are large,
In many cases, it is tested with a scale model, and when conducting a seismic test with a scale model, it is necessary to apply vibration at a frequency that is higher than the vibration frequency of the actual earthquake in proportion to the scale ratio. For example, the upper limit frequency of an earthquake is about 10 Hz, but if the scale ratio is 1/10, it is 100.
It is necessary to add vibration up to Hz, and there is a demand for a vibration tester capable of vibrating up to such a high frequency range.

Conventionally, there are various types of multi-degree-of-freedom vibration testers. For example, although not shown as a vibrating means, an electric vibration generator is used, and vibration in one direction affects vibrations in other directions. There is an invention described in Japanese Patent Publication No. 49-7171 (hereinafter referred to as a first conventional example) having a structure including a guide frame and guide frame guide means so as not to give.

As another example, Japanese Patent Publication No. 54-44461 (hereinafter referred to as a second conventional example) shown in FIGS. 7 and 8
In the drawings, the vibrating table 501 is supported by a vibrating table guiding device 502 with a static pressure bearing so that it can vibrate only in one plane and is vibrated in each direction of multiple degrees of freedom. In (1), a plurality of synchronously connected vibration hydraulic cylinders 503, 503 are allowed to move in a direction perpendicular to the vibration direction of these vibration hydraulic cylinders, and a vibration force in the vibration direction is applied. The vibrating table 50 by means of couplers 506 and 506 having hydrostatic bearings for transmitting
It is configured such that vibration can be obtained by connecting to the corresponding portion of 1. The same applies to the Y direction, but details are omitted.

Further, as another example, there is an invention described in Japanese Patent Publication No. 3-81093 (hereinafter referred to as a third conventional example), which is the application of the present applicant, shown in FIGS. The invention shown in FIG. 10 is a multi-degree-of-freedom vibration tester in the X and Y directions, and includes a horizontally-shaped rectangular parallelepiped vibration table 1 and, for example, the vibration table 1 as the X-direction vibration tester. Is provided with a first vibrating shaft 2-1 that slidably vibrates only in the X direction on one side wall surface 1-1 of the X direction of the vibrating table.
To the other side wall surface 1-11 in the direction 1-
1 and the same in the Y direction. As shown in FIG. 11, in the Z direction, a third vibrating shaft 2-3 for vibrating in the Z direction is provided in the lower center of the vibrating table. It was done.

[0007]

In the first conventional example, since the guide frame and the guide frame guide means are required, there is a drawback that the overall structure of the multi-degree-of-freedom vibration testing machine becomes complicated and large.

In the second conventional example, since the structure of the coupler is a U-shaped fork bracket, the vibration system is increased by one due to the coupler, and not only the frequency characteristic drops in the high range, but also in the axial direction. Since the guide is also used as the vibration cylinder, there are drawbacks that the size and other restrictions can be restricted and the structure is not very robust.

The third conventional example is optimal for a large-sized test object, but has a drawback that the entire structure is complicated and large for a small-sized test object.

Therefore, an object of the present invention is to solve the conventional drawbacks and to propose a multi-degree-of-freedom vibration tester which is simple in the entire structure and is most suitable for the vibration test of a small test object.

[0011]

In order to solve the above-mentioned problems, according to claim 1, a horizontally-formed rectangular rectangular parallelepiped vibrating table and an electromotive force connected to one side wall surface of the vibrating table in the X direction. Sets of vibrating means having a die vibration generator, a plurality of vibrating means having an electrodynamic vibration generator also connected to one side wall surface in the Y direction, and a supporting means for supporting the gravity of the vibrating table. The vibrating means is connected to a bearing connecting portion having a static pressure bearing at one end of the vibrating shaft at a predetermined connecting portion with the vibrating table, and the vibrating shaft is provided around the middle portion of the vibrating shaft. And a plurality of sets of vibrating means formed on the floor by fixing a vibrating table of an electrodynamic vibration generator to the other end of the vibrating shaft and having a hydraulic guide formed of a static pressure bearing. The supporting means is provided on the lower surface of the vibrating table between the floor surface and the vibrating table so that the supporting means vibrates independently in the X and Y directions in the horizontal plane. And configure by providing a pressure bearing multi-degree-of-freedom vibration test machine (hereinafter referred to as first embodiment).

Further, according to a second aspect of the present invention, a horizontally formed rectangular parallelepiped vibrating table and one of the vibrating table in the X and Y directions are provided.
In addition to having a plurality of sets of vibrating means connected to a predetermined part of the side wall surface, the vibrating table is connected to a predetermined part of the lower surface, and a static pressure bearing is provided at one end of the vibrating shaft at the connecting part. A bearing guide connecting portion is connected and a hydraulic guide including a hydrostatic bearing is provided around an intermediate portion of the vibration shaft, and the vibration table of the electrodynamic vibration generator is fixed to the other end of the vibration shaft, and , A multi-degree-of-freedom vibration tester was constructed by a predetermined number of vibration means having an electrodynamic vibration generator formed on the floor by providing an air spring mechanism under the vibration table (see the second embodiment below. Called an example).

According to a third aspect of the present invention, there is provided a vibrating table which is horizontally formed and has a rectangular parallelepiped shape having one side of 25 cm to 100 cm, and an electrodynamic type which is connected to a predetermined portion of one side wall surface in the X and Y directions of the vibrating table. Electrokinetic vibration generation provided with a pair of vibrating means in the X and Y directions having a vibration generator, and an air spring mechanism formed on a floor surface connected to a predetermined portion below the vibrating table A multi-degree-of-freedom vibration testing machine was constructed by a set of Z-direction vibrating means having a machine (hereinafter referred to as a third embodiment).

[0014]

As described above, according to the invention of claim 1, a plurality of sets of vibrating means having a rectangular parallelepiped-shaped vibrating table formed horizontally and electrodynamic vibration generators in X and Y directions and gravity of the vibrating table. Since it is composed of a supporting means for supporting, a multi-degree-of-freedom vibration testing machine having a simplified overall structure and convenient to handle is obtained,
Further, since the invention of claim 2 is provided with the vibrating means in the Z direction and the air spring mechanism together on the lower surface of the vibrating table, a simplified and convenient multi-degree-of-freedom vibration testing machine can be obtained. According to the invention of Item 3, since the vibrating table has a small size in which one side is limited, a multi-degree-of-freedom vibration tester suitable for a small test object can be obtained.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a plan view of the first embodiment, and FIG. 2 is a side view of the first embodiment. 1 is a rectangular parallelepiped vibrating table, 1-1 is the vibrating table X
Direction 1 side wall surface, 1-2 is Y direction 1 side wall surface of the vibrating table, 1-
Reference numeral 5 is the lower surface of the vibrating table. 2 is a vibrating means, 2-1 is an X-direction exciting axis, 2-2 is a Y-direction exciting axis, 2-3 is a Z-direction exciting axis, 3-1 is an electrokinetic vibration generator in the X-direction, 3-2 is a Y-direction electrodynamic vibration generator, 3-3 is a Z-direction electrodynamic vibration generator, 4-1 is an X-direction bearing portion connecting portion, and 4-2 is a Y-direction bearing portion connecting portion. , 4-3 is a bearing connecting portion in the Z direction, 6-
1 is an X-direction hydraulic guide, 6-2 is a Y-direction hydraulic guide, 6-3 is a Z-direction hydraulic guide, 7-1 is an X-direction vibration table, 7-2 is a Y-direction vibration table, 7-3 is a vibration table in the Z direction, and 12 is a hydrostatic bearing.

In the first embodiment, as shown in FIGS. 1 and 2,
Horizontally formed rectangular rectangular parallelepiped vibrating table 1 and the vibrating table 1
A plurality of sets of vibrating means 2 having an electrodynamic vibration generator 3-1 connected to one side wall surface 1-1 in the X direction, and an electromotive force also connected to one side wall surface 1-2 in the Y direction. Type vibration generator 3-2
And a supporting means for supporting the gravity of the vibrating table 1. The vibrating means 2 comprises:
For example, in the X direction, a bearing portion connecting portion 4-1 provided with a hydrostatic bearing at one end of the vibration shaft 2-1 is connected to a predetermined connection portion with the vibration table 1, and the vibration shaft 2- 1 has a hydraulic guide 6-1 composed of a static pressure bearing around the middle part of the first part, and the vibration table 7- of the electrodynamic vibration generator 3-1 is provided at the other end of the vibration shaft.
A plurality of sets of vibrating means 2 formed by fixing 1 to the floor surface 9-1 are configured. The vibrating means 2 in the Y direction also have the same configuration, and only reference numerals are given and the description thereof is omitted. The vibration table 1
The predetermined connection part with is a connection part in which a plurality of sets of vibration means are arranged in parallel to each other and at the same intervals to a straight line in the vibration direction that crosses the center of gravity of the vibrating table 1. is there.
In addition, the supporting means for supporting the gravity of the vibrating table 1 is a static pressure bearing between the lower surface 1-5 of the vibrating table 1 and the floor surface 9-1 so that the vibrating table 1 vibrates independently in the X and Y directions in a horizontal plane. The first
The multi-degree-of-freedom vibration testing machine according to the embodiment is configured, and the multi-degree-of-freedom vibration testing machine according to the above-described configuration activates the vibrating means 2 in the X or Y direction for the test object mounted on the vibrating table 1. The vibration test is performed according to.

FIG. 3 is a plan view of the second embodiment, and FIG. 4 is a side view of the second embodiment. In the figure, 1-5 is the lower surface of the vibrating table 1, 2-3 is a Z-direction excitation axis, 3-3 is a Z-direction electrodynamic vibration generator, 4 is a Z-direction excitation means, and 4-3. Is a bearing connecting portion in the Z direction, 6-3 is a hydraulic guide in the Z direction, 7-3
Is a vibration table in the Z direction, 9-3 is a base, and 18 is an air spring mechanism.

In the second embodiment, similarly to the first embodiment, the horizontally and horizontally rectangular rectangular parallelepiped vibration table 1 is provided with the vibrating means 2 in the X and Y directions and the vibrating means 4 in the Z direction. Provided,
The multi-degree-of-freedom vibration tester in the X, Y, and Z directions is configured. Therefore, the description of the vibrating means in the X and Y directions of the second embodiment will be omitted, and the vibrating means 4 in the Z direction will be described. The vibrating means 4 is provided in a predetermined number on the lower surface 1-5 of the vibrating table 1 in a predetermined number. The vibrating table 1
The predetermined portion of the lower surface 1-5 is a portion that is symmetrical in the direction orthogonal to the straight line passing through the center of gravity of the vibrating table 1 in the vibration direction of the Z direction and has the same interval. In FIG. 3, four sets are shown on the vibrating table 1 by dotted lines, but the invention is not limited thereto. Since a plurality of sets of vibrating means 4 are similarly configured,
The set of vibrating means 4 will be described. The vibrating means 4 is connected to a predetermined portion of the lower surface 1-5 of the vibrating table 1, and the vibrating shaft 2 is attached to the connecting portion.
-3 is connected to a bearing portion connecting portion 4-3 provided with a static pressure bearing, and a hydraulic guide 6-3 made of a static pressure bearing is provided around the intermediate portion of the vibrating shaft 2-3. The vibration table 7-3 of the electrodynamic vibration generator 3-3 is fixed to the other end of the vibration shaft 2-3,
In addition, the air spring mechanism 18 is provided below the vibration table 7-3.
Is provided. The multi-degree-of-freedom vibration tester having the above-mentioned configuration can perform the vibration test by activating the vibrating means in each direction.

FIG. 5 is a plan view of the third embodiment, and FIG. 6 is a side view of the third embodiment. The third embodiment is a multi-degree-of-freedom vibration tester in which the size of the vibrating table 1 is formed to have a side of 25 cm to 100 cm, and the vibrating means in the X, Y, and Z directions constitutes one set. The configuration is self-evident from the description of the first and second embodiments, and a description thereof is omitted. The multi-degree-of-freedom vibration tester of the third embodiment is particularly suitable for testing small test pieces.

[0020]

As described above in detail, according to the invention of claim 1, a horizontally-formed rectangular rectangular parallelepiped vibrating table and one predetermined side wall surface in the X and Y directions of the vibrating table are electrokinetic. A plurality of sets of vibrating means having a mold vibration generator are connected, and a static pressure bearing is provided between the lower surface of the vibrating table and the floor surface so that the vibrating table vibrates independently in each direction. Since it is configured, there is an effect that the entire configuration is simplified and a multi-degree-of-freedom vibration testing machine that is convenient to handle can be obtained. Further, in the invention of claim 2, similarly, a plurality of sets of vibrating means are also provided in the Z direction, so that the overall structure is simplified and the multi-degree-of-freedom vibration testing machine in the X, Y and Z directions is convenient for handling. There is an effect that can be obtained. Further, according to the invention of claim 3, the size of the vibrating table is 25 cm to 100 cm on each side, and each vibrating table is composed of one set of vibrating means. The effect is that a vibration tester with a degree of freedom can be obtained.

[Brief description of drawings]

FIG. 1 is a plan view of a first embodiment of the present invention.

FIG. 2 is a side view of the first embodiment of the present invention.

FIG. 3 is a plan view of a second embodiment of the present invention.

FIG. 4 is a side view of the second embodiment of the present invention.

FIG. 5 is a plan view of a third embodiment of the present invention.

FIG. 6 is a side view of the third embodiment of the present invention.

FIG. 7 is a plan view of a second conventional example.

FIG. 8 is a side view of a second conventional example.

FIG. 9 is a plan view of a third conventional example (X and Y directions).

FIG. 10 is a side view of a third conventional example (X and Y directions).

FIG. 11 is a side view of a third conventional example (X, Y and Z directions).

[Explanation of symbols]

 1 Shaking table 1-1 X direction 1 side wall surface 1-2 Y direction 1 side wall surface 1-5 Lower surface 2 Excitation means 2-1 X direction excitation axis 2-2 Y direction excitation axis 2-2 Z direction excitation Axis 3-1 X-direction electrokinetic vibration generator 3-2 Y-direction electrokinetic vibration generator 3-3 Z-direction electrokinetic vibration generator 4-1 X-direction bearing connecting part 4-2 Y-direction bearing Connection part 4-3 Z direction bearing part connection part 6-1 X direction hydraulic guide 6-2 Y direction hydraulic guide 6-3 Z direction hydraulic guide 7-1 X direction excitation table 7-2 Y direction excitation table 7- 3 Z-direction vibration table 9-1 Floor 9-3 Base 12 Hydrostatic bearing 18 Air spring mechanism 501 Shaking table 502 Shaking table guiding device 503 Shaking hydraulic cylinder 505 Shaking hydraulic cylinder 506 Coupler 507 Coupler

Claims (3)

[Claims] 1. A plurality of sets of vibrating means having a horizontally-arranged rectangular parallelepiped-shaped vibrating table and an electrodynamic vibration generator connected to one side wall surface of the vibrating table in the X direction, and Y. A plurality of sets of vibrating means having electrokinetic vibration generators connected to one side wall surface in the same direction, and supporting means for supporting the gravity of the vibrating table, the vibrating means having a predetermined shape with the vibrating table. A bearing portion connecting portion, in which a static pressure bearing is provided at one end of the vibration shaft, is coupled to the coupling part of, and a hydraulic guide made of a static pressure bearing is provided around the middle portion of the vibration shaft, and A plurality of sets of vibrating means formed on the floor by fixing a vibrating table of an electrodynamic vibration generator to the other end, wherein the supporting means are independent in the X and Y directions in a horizontal plane. The multi-degree-of-freedom vibration test is characterized in that a static pressure bearing is provided between the bottom surface of the vibrating table and the floor surface so that it vibrates. Test machine. 2. A vibrating table having a rectangular parallelepiped shape formed horizontally, and a plurality of sets of vibrating means connected to a predetermined portion of one side wall surface in the X and Y directions of the vibrating table. Is connected to a predetermined site on the lower surface of the
A bearing portion connecting portion provided with a static pressure bearing at its end is connected, and a hydraulic guide consisting of a static pressure bearing is provided around the middle portion of the vibrating shaft, and the other end of the vibrating shaft is provided with The vibration table is fixed, and a predetermined number of vibration means having an electrodynamic vibration generator formed on the floor by providing an air spring mechanism under the vibration table And a multi-degree-of-freedom vibration tester. 3. One side formed horizontally is 25 cm to 10 cm.
0 cm rectangular parallelepiped vibrating table and X and Y of the vibrating table
A pair of X- and Y-direction vibrating means having an electrodynamic vibration generator connected to a predetermined portion of one side wall surface in the same direction, and formed on the floor surface by being connected to a predetermined portion below the vibrating table. Multi-degree-of-freedom vibration testing machine, which comprises a pair of Z-direction vibrating means having an electrodynamic vibration generator provided with the air spring mechanism described above.